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Finding the Fourth Proportional to 718,457.10, 991,477.71 and 396,178.62

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Solution

The fourth proportional to 718,457.10, 991,477.71 and 396,178.62 is: 546,730.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,457.10 : 991,477.71 = 396,178.62 : x
  2. Step 2: Convert to fraction form
    718,457.10/991,477.71 = 396,178.62/x
  3. Step 3: Cross multiply
    718,457.10x = 991,477.71 × 396,178.62
  4. Step 4: Simplify right side
    718,457.10x = 392,802,270,908.56
  5. Step 5: Solve for x
    x = 392,802,270,908.56/718,457.10
  6. Step 6: Final answer
    x = 546,730.31

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.